Condensing turbonator starting method

Abstract

The invention discloses a condensing turbonator starting method. The method comprises the steps that at time of impulse starting, a unit vacuum breaking valve is adjusted when the rotor speed reachesa medium speed of 900-1000 r/min for warming-up, the exhaust steam temperature is increased uniformly to 60-70 DEG C with the speed increase not higher than 5 DEG C/min, warming-up is performed for 30-40min at the exhaust steam temperature, vibration is checked, and if the sound is normal, a unit surpasses a critical point at the speed of 200 r/min; after the unit surpasses the critical point, thespeed of the unit rises uniformly to 300 r/min from 100 r/min; after grid-connection is completed and the thermal expansion value reaches 70%-80% of the value at full load, the vacuum breaking valveis closed, it is noted that the exhaust steam temperature decreasing amplitude should not exceed 5 DEG C/min when the valve is closed, and at the moment, a condensing turbonator is started. By adopting the technical scheme provided by the invention, the exhaust steam temperature is high during warming-up of a turbine, unit thermal expansion is uniform, the differential expansion is small, the unitis free of severe vibration when surpassing the critical point, the unit vibrates stably in a loading process after grid-connection, and the load can become full in a short time.

Description

technical field [0001] The invention belongs to a condensing steam turbine generator, in particular to a starting method for a condensing steam turbine generator. Background technique [0002] At present, the known start-up methods of steam turbines in cold state are inspection, test oil pump, throwing car, heating pipe to the front of electric main steam valve, test of flexibility of regulation system, start-up of auxiliary equipment, sending steam seal, warming pipe to front of automatic main steam valve , Rush to warm up the machine, and connect to the grid with load. [0003] During the warm-up process, the vacuum breakout door of the unit is always closed. In the initial stage of the unit, the steam intake is small, the exhaust steam temperature is low, and the thermal expansion of each part of the unit is inconsistent, causing vibration, especially when the critical point is passed. The vibration increases sharply, which may easily lead to accidents such as blade fall...

AI Technical Summary

Problems solved by technology

[0003] During the warm-up process, the vacuum breakout door of the unit is always closed. In the initial stage of the unit, the steam intake is small, the exhaust steam temperature is low, and the thermal expansion of each part of the unit is inconsistent, causing vibration, especially when the critical point is passed. Vibration increases sharply, which can easily lead to accidents such as blade falling off

[0004] After the unit is connected to the grid, if the load is too fast, the exhaust steam volume will increase, the exhaust steam temperature will rise, and the rotor temperature will rise rapidly. A large expansion difference occurs, the unit generates abnormal displacement, and excessive vibration occurs, forcing the unit to reduce load or stop